TECHNICAL INFORMATION B890 Rotary Iron © 2003 Miele
B890 Rotary Iron - Table of Contents 1.0 CONSTRUCTION & DESIGN 1.1 Appliance Overview 1 1.2 Controls Overview 1 1.3 Technical Specifications 2 1.4 Layout of Mechanical Components 3 1.5 Layout of Electrical Components 3 2.0 INSTALLATION Installation Procedures 5 3.0 COMMISSION and OPERATION 3.1 General Operation 7 3.1.1 Opening the Appliance for Use 7 3.1.2 Main Power Switch 7 3.1.3 Ironing Temperature 8 3.1.4 Ironing Temperature / Clothing Care Symbols 8 3.1.
5.0 SERVICE and MAINTENANCE 5.1 Control Electronic – Removal 17 5.2 Transformer – Removal 17 5.3 Main Electronic Unit – Removal 18 5.4 Foot Switches – Removal 18 5.5 Finger Guard Switch – Removal 19 5.6 Limit Switches – Removal 19 5.7 Heater Plate Drive Motor - Removal 20 5.8 Roller Assembly - Removal 21 5.9 Free Wheel Mechanism - Removal 22 5.10 Drive Shaft – Removal 23 5.11 Roller Drive Motor - Removal 23 5.12 Heater Plate Cover - Opening 24 5.
B890 Rotary Iron – List of Figures 1-1 Overview of Rotary Iron 1 1-2 Overview of Controls 1 1-3 Overview of Mechanical Components 3 1-4 Overview of Electrical Components 3 2-1 Removing the Feed Board 5 2-2 Removing the Protective Cover from the Roller 5 3-1 Opening the Rotary Iron 7 3-2 On / Off Switch 7 3-3 Temperature Adjustment Control 8 3-4 Roller Speed Control 9 3-5 Foot Pedal Operation 9 3-6 Emergency Release Latch 10 3-7 Transit Fitting 10 4-1 Heater Plate Drives 12 4-2 Ro
B890 Rotary Iron Technical Information 1.0 Construction and Design 1.1 Appliance Overview Figure 1-1: Overview of Rotary Iron 1.
B890 Rotary Iron Technical Information 1.3 Technical Specifications Height Width Depth Weight 37” (41 ¾” folded) 39 3/8” (16 3/8 folded) 16 3/8” 84 lbs. Table 1-1: Product Specifications The appliance is supplied with a power cord and NEMA 6-20 P plug ready for connection to an AC single phase 208 V 60 Hz supply. The fuse rating is 20 amps. The actual amperage draw from the appliance is 13 amps.
B890 Rotary Iron Technical Information 1.4 Layout of Mechanical Components Figure 1-3: Overview of Mechanical Components (B890 shown) 1.
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B890 Rotary Iron Technical Information 2.0 Installation 1. Unpack / uncrate the appliance from the box. 2. Remove the Transit Fitting - see supplementary information for details. 3. Move the appliance to the desired location - see supplementary information for details on moving the appliance. 4. Install recommended plug to the power cord - DO NOT plug in at this time. 5. Unlatch; remove the Feed Board from the appliance - see figure 1.
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B890 Rotary Iron Technical Information 3.0 Commission and Operation 3.1 General Operation 3.1.1 Opening the Appliance for Use Figure 3-1: Opening the Rotary Open 1. Hold the ironing table and release the catch situated on the right hand side underneath the ironing table. 2. Swing the top section of the rotary ironer to the side until it clicks into position horizontally. 3.1.2 Main Power Switch The appliance is switched on and off with the “I=On / 0=Off” button.
B890 Rotary Iron Technical Information 3.1.3 Ironing Temperature The temperature selector is used to set the ironing temperature. The individual temperature ranges are marked by dots on the dial around the temperature selector. These correspond to the international clothing care symbols for ironing (see 3.1.3). Turn the temperature selector to the temperature. The o C temperature indicator light will come on while the heater plate is heating up. Figure 3-3: Temperature Adjustment Control 3.1.
B890 Rotary Iron Technical Information 3.1.5 Adjusting the Roller Speed There are 5 roller speed settings, from low (approx. 2 meters per minute) to high (approx. 4.5 meters per minute). Turn the knob clockwise to increase the speed. A lower roller speed makes it easier to iron complicated articles such as shirts and blouses. It is also best to select a lower roller speed when ironing folded items, which may require more than one pass through the ironer to get them smooth and dry.
B890 Rotary Iron Technical Information 3.2 Emergency Release In the event of a power loss when the iron is in use the heater plate may be in a position where it could continue to make contact with the roller. The item being ironed would then be held there with the risk of it becoming damaged. To free the trapped item - Pull upward on the emergency release lever to reduce the pressure between the heater plate and the roller; this will allow easy removal of the item being ironed.
B890 Rotary Iron Technical Information 4.0 Description of Function 4.1 Electronics The B890 is equipped with two (2) separate electronic board assemblies. The Control Electronic (A1) is fitted to the inside of the top cover, and houses the user controls. The Main Electronic (N2) is located beneath a cover on the top of the main vertical support of the appliance. The Main Electronic Is responsible for providing power to the components. 4.2 4.3 4.
B890 Rotary Iron Technical Information When the user releases the foot pedal, the drive motor is energized in the opposite direction. The eccentric cam (item 7) rotates – pressure is released from the spring (item 1) and the heater plate moves away from the roller. The drives continue until the “Plate OFF Roller Switch” is actuated by the Guide Strip (item 4). Heater Plate Drives 6 7 1. 2. 3. 4. 5. 6. 7.
B890 Rotary Iron Technical Information 4.5 Roller Assembly / Drives Figure 4-2: Roller and drive components A single driveshaft is connected to the roller via a free-wheel bearing which permits the roller to turn in one direction only. The driveshaft is mechanically connected to the Drive Motor (M17). Power to the motor (24 VDC) is controlled by the users actions via the footplate (see Footswitches 4.3).
B890 Rotary Iron Technical Information 4.6 Heater Circuit Refer to figure 4-3. The Heaterplate contains three heating elements within a parallel Circuit (1 Kw / 52 ohms for each element). The temperature is regulated using an Adjustable Temperature Control Device (see figure 4-4) mounted in series before the heating elements. In addition, the heating circuit contains two Thermal (Hi-limit) Cutouts also electrically mounted in series to the heating elements.
B890 Rotary Iron Technical Information Figure 4-4: Heater temperature control 4.7 Finger Guard Switch Figure 4-5: Finger Guard The Finger Guard is the small lip in the front of the Heater Plate Assembly, that can be lifted slightly. The Finger Guard Switch is actuated if the Finger Guard is lifted or moved from it’s regular position. This system ensures that if the operator should accidentally make contact with the Heaterplate while the Roller is turning; power is interrupted to prevent injuries.
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B890 Rotary Iron Technical Information 5.0 5.1 Service and Maintenance Control Electronic (A1) - Removal 1. Remove the cover screw and lift off the cover (rear first). 2. Tilt cover forward and upward from the appliance. Note Use caution when removing cover from the appliance as wiring is still connected to the control board mounted inside the cover. To Remove the Control Panel Circuit Board from the cover continue as follows: 3. Remove the screws securing the circuit board to the inside of the cover. 4.
B890 Rotary Iron Technical Information 5.3 Main Electronic Unit (N2) - Removal 1. Lift the handle (locking catch) at the right under the table and hold the table. 2. Tilt the folding part of the ironer down until it is vertical and locks into place. 3. Remove the screw from the cover at the top of the support column. 4. Remove the cover from the column (it may be necessary to remove the spring). 5. Remove the left cover from the column. 6. Remove the screw. 7. Disconnect the electrical connections. 8.
B890 Rotary Iron Technical Information 5.5 Finger Guard Switch (F6/5) - Removal 1. 2. 3. 4. Perform the “Opening the Heater Plate Cover” procedure. Remove the 2 screws from the switch holder. Disconnect the plug connections. Remove the switch. Note The switching point of the finger guard strip cannot be modified. 5.6 Limit Switches (S26 & S27) - Removal 1. 2. 3. 4. 5. Remove the 2 screws under the table from the motor unit cover. Remove the cover. Disconnect the plug from the appropriate switch.
B890 Rotary Iron Technical Information 5.7 Heater Plate Drive Motor (M18) – Removal 1. Remove the 2 screws under the table from the motor unit cover. 2. Remove the cover. Note How wiring is routed so it can be rerouted correctly during reassembly. 3. Remove the retaining screw from the left and right guide strips. 4. Tilt the guide strips with the switches slightly and remove them. 5. Disconnect the plug connections from the DC motor. 6. Remove the e-clip from the shaft. 7.
B890 Rotary Iron Technical Information 5.8 Roller Assembly - Removal 1. Remove the feed board. 2. Open the ironing cloth at the left end. Complete removal of cloth is not necessary. 3. Remove the roller end plate. Note Adhesive residue may make it difficult to remove the end plate. 4. Remove the middle screw (Torx T30) from the interior of the roller and remove it with its washer. See figure 1. Figure 5-1: End of roller 5. Loosen the roller at the right by giving it an axial jolt using both hands. 6.
B890 Rotary Iron Technical Information 5.9 Free-wheel Mechanism - Removal Figure 5-2: Free-wheel mechanism 1. Perform the “Roller Assembly - Removal” procedure. 2. Unscrew the three screws from the interior of the roller. 3. Remove the free-wheel mechanism and bearing flange. Note Reassemble by following these instructions in reverse order. When refitting, position the free-wheel mechanism and bearing flange on the roller shaft. Then place the roller in position and turn it until the screw holes align.
B890 Rotary Iron Technical Information 5.10 5.11 Driveshaft - Removal 1. Remove the screw from the rear of the cover around the control panel. 2. Lift the hood at the rear and unclip it at the front. 3. Remove the cover assembly. 4. Perform the “Roller Assembly - Removal” procedure. 5. Access the interior side of the frame (where cover was just removed from). 6. Remove the e-clip from the end of the drive shaft (next to the gear) 7.
B890 Rotary Iron Technical Information 5.12 5.13 Heater Plate Cover – Opening 1. 2. 3. 4. 5. 6. Switch on the machine. Operate the foot switch to lower the heater plate onto the roller. Switch off the machine and unplug it from the mains. Remove the screws from the left and right end-caps. Remove the left and right end caps. Lift the cover at the top and carefully slide it down onto the folding part. Leaf Spring With Holder - Replacement 1.
B890 Rotary Iron Technical Information 5.15 Hinge Pressure Spring – Setting / Adjustment Note Setting should only be made with the heater plate lowered onto the roller. 1. 2. 3. 4. 5. 6. Lower the heater plate onto the roller. Remove the 2 screws under the table from the motor unit cover. Remove the cover. Unscrew the bolt from the cross pin. Apply locking compound to the end of the bolt.
B890 Rotary Iron Technical Information 5.17 Bowden Cable - Releasing Tension 1. Access the underside of the iron directly under the main vertical support. 2. Use a suitable tool to grasp the hook end of the spring. 3. Carefully lift the spring from its mounting hole. 4. Move spring away from the mounting hole and allow spring to pull itself into the spring opening.
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B890 Rotary Iron Technical Information 6. Fault Diagnosis 6.1 Electronic Boards 6.1.
B890 Rotary Iron Technical Information 6.1.
B890 Rotary Iron Technical Information 6.
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